Question

5. How many bricks of size 20 cm x 10 cra x 5 cm are needed tomake a wall of size 20 mx 50 cm x 5 m?

(1) 60000 (2) 80000 (3) 100000 (4) 50000​

Answer 1

Answer:

Dimension of brick are =20cm×10cm×5cm

volume of 1 brick =20×10×5=1000cm

3

Dimension of wall =10m×15m×0.2m

volume of wall =10×15×0.2=30m

3

now no. of brick requried to make wall =

volume of 1 brick/volume of wall

no. of bricks = 30m³ / 1000m³

=30 / 100 ×10⁶

=30×10³

[no. of bricks =30,000 bricks.]